Incandescent electric lamp



(No Model.)

E. P. THOMPSON.

INGANDESGENT ELECTRIC LAMP.

No. 366,352. Patented July 12, 1887.`

a @M awww@ `UNITED STATES PATENT OFFICE.

EDVAED P. THOMPSON, OE ELIZABETH, NEV JERSEY.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 366,352, dated July 12,15387.

(No model.)

To all whom, it may concern:

Be it known that I, EDWARD I). THOMPSON, acitizen of the United States,residing in Elizabeth, in the county of Union and State of New Jersey,have invented certain new and useful ImprovementsinIncandescentElectricLam ps, of which the following is a specification.

The invention relates to the construction of globes for incandescentelectric lamps, especially the globes for lamps employing large carbonfilaments.

The object of the invention is to reduce as much as possible the spacenecessary to be evacuated.

The invention consists, in general terms, in

l inserting within an outer globe an inner globe or tube which shalloccupy the space within the alms of the filament, and in providing afixture with a projection fitting within the tube, and also in employinga non-incandescing conductor connected with the respectivesupply-conductors for neutralizing the static charge of the filament. A

In the accompanying drawings, Figure l is an elevation of a globeembodying the features ofthe invention. Figs. 2 and 3 show certaindetails.

Referring to the figures, A represents an outer inclosingglobe of glassdesigned to contain the filaments I?. This globe is open at one end, asshown at a, the sides being preferably drawn in upon the opening. Atube, O, has its end flaring slightly, as shown at c. This is designedto be inserted through the opening a, with its edges coming in contactwith the edges ofthe globe A, The two globes are sealed together alongtheir adjacent edges, t-he leading-in wires being sealed in the joint.

This may be accomplished by any of the well- Y The filament is may withadvantage be silvcred upon its surface, or in any other convenientmanner made capable of diffusing the light from the lamp. The block isprovided with two contact-pieces, f and f2, designed to be connectedwith two leading-in wires. Supply-conductors L and LZ lead,respectively, to these contact-pieces. For the purpose of causing theloose carbon which is thrown off from the filaments of incandescentlights to be attracted toward and deposited upon the surface of theinner globe, one ofthe conductors-L", for instance-may with advantage beconnected through wire Z2, laid near the surface or just beneath thesurface of the projection F. In this manner the inductive effects of thecurrent traversing the coil Zl will attract the particles of carbontoward itself.

Suitable clips or springs, g', are placed in the side of the projectionF, for the purpose of holding the globe in position.

It is evident that there are various ways of modifying the 'shape of thetwo globes without departing from the spirit ofthe invention; butpreferably a globe having its sides approximately straight is used forthe outer globe, as well as for the inner one.

Instead of the hooks shown in Fig. 3 for making electrical co inectionswith theleadingin wires, any suitalile form of pressure-clips orcontact-plates may be employed.

I claim as my invention- 1. The combination of the outer inclosingglobeof an incandescent lamp, atube orglobc projecting within the same, and afixture for receiving the lamp having a projection iitting within saidtube, substantially as described.

2. The combination, with an incandescent electric lamp having a tubeprojecting within the arms of the lament, of a tixture having aprojection extending within said tube, which projection is coated withlight-diffusing substance, substantially as described.

3. The combination, with an incandescent electric lamp having its wallextending inward between the arms of a filament, of a projectiondesigned to extend within such portion of the wall,and a conductorconnected with a supply-conductor applied to the projection,substantially as described.

IOO

4. The combination, with an incandescent- ,ors and extending Within thearms of the filaeiectric lamp, of a non-incandescing conductor ment,substantially as described.V connected at its respective ends with there-. In testimony whereof I have hereunto subspective supply-conductors,and extending in scribed my name this 17th day of August, A. 5 a.direction approxiateiv'mraliel with the D. 1886.

lament.

5. The combination, with an incandescent EDWARD P THOMPSON. electriclamp having its Wall extending in- Witnesses: v ward between the arms ofthe lament, of a DANL. W. EDGECOMB,

1o conductor connected with the supply-conduct CHARLES A. TERRY.

